diff --git a/packages/plugin-stripe/src/types.ts b/packages/plugin-stripe/src/types.ts
index 69cff6751c4..9caec59997b 100644
--- a/packages/plugin-stripe/src/types.ts
+++ b/packages/plugin-stripe/src/types.ts
@@ -1,6 +1,18 @@
 import type { CollectionSlug, Payload, Config as PayloadConfig, PayloadRequest } from 'payload'
 import type Stripe from 'stripe'
 
+/**
+ * A handler function invoked when a Stripe webhook event is received.
+ *
+ * @template T - The type of the Stripe event. Defaults to `any`.
+ *
+ * @param args.config - The raw Payload configuration object.
+ * @param args.event - The Stripe webhook event object.
+ * @param args.payload - The initialized Payload instance.
+ * @param args.pluginConfig - The resolved Stripe plugin configuration, if available.
+ * @param args.req - The incoming Payload request object.
+ * @param args.stripe - An initialized Stripe SDK instance.
+ */
 export type StripeWebhookHandler<T = any> = (args: {
   config: PayloadConfig
   event: T
@@ -10,22 +22,79 @@ export type StripeWebhookHandler<T = any> = (args: {
   stripe: Stripe
 }) => Promise<void> | void
 
+/**
+ * A map of Stripe webhook event names to their corresponding handler functions.
+ * The key should match the Stripe event type (e.g. `'customer.created'`).
+ */
 export type StripeWebhookHandlers = {
   [webhookName: string]: StripeWebhookHandler
 }
 
+/**
+ * Describes the mapping between a single Payload document field and a Stripe resource property.
+ *
+ * @param fieldPath - The dot-notation path to the field in the Payload document (e.g. `'name'`).
+ * @param stripeProperty - The property key on the corresponding Stripe resource (e.g. `'name'`).
+ */
 export type FieldSyncConfig = {
   fieldPath: string
   stripeProperty: string
 }
 
+/**
+ * Maps each supported Stripe resource type (plural API key) to its singular display name.
+ * This is used to derive `stripeResourceTypeSingular` from `stripeResourceType` without
+ * maintaining a separate, manually-synced union type.
+ *
+ * @internal
+ */
+type StripeResourceSingularMap = {
+  customers: 'customer'
+  products: 'product'
+}
+
+/**
+ * The set of Stripe resource types that the plugin supports for bidirectional sync.
+ * Derived directly from the Stripe SDK's instance keys so it stays in sync with the SDK.
+ *
+ * @internal
+ */
+type SupportedStripeResourceType = keyof Pick<Stripe, 'customers' | 'products'>
+
+/**
+ * Configuration for syncing a Payload collection with a Stripe resource.
+ *
+ * @param collection - The slug of the Payload collection to sync.
+ * @param fields - An array of field mappings between the Payload document and the Stripe resource.
+ * @param stripeResourceType - The Stripe API resource key (e.g. `'customers'`, `'products'`).
+ *   This is derived from the Stripe SDK's type definitions.
+ * @param stripeResourceTypeSingular - The singular form of the Stripe resource type
+ *   (e.g. `'customer'`, `'product'`). This is derived from `stripeResourceType` via
+ *   `StripeResourceSingularMap`, so both values are always kept in sync.
+ */
 export type SyncConfig = {
   collection: CollectionSlug
   fields: FieldSyncConfig[]
-  stripeResourceType: 'customers' | 'products' // TODO: get this from Stripe types
-  stripeResourceTypeSingular: 'customer' | 'product' // TODO: there must be a better way to do this
+  stripeResourceType: SupportedStripeResourceType
+  stripeResourceTypeSingular: StripeResourceSingularMap[SupportedStripeResourceType]
 }
 
+/**
+ * Configuration options for the Payload Stripe plugin.
+ *
+ * @param isTestKey - When `true`, the Stripe dashboard links in the admin UI will
+ *   point to Stripe's test-mode environment. Should match whether `stripeSecretKey`
+ *   is a test key (`sk_test_...`).
+ * @param logs - When `true`, the plugin will log Stripe sync operations to the Payload logger.
+ * @param rest - When `true`, exposes a REST proxy endpoint (`/api/stripe/rest`) that allows
+ *   the Payload admin to make authenticated Stripe API calls from the client.
+ *   @default false
+ * @param stripeSecretKey - Your Stripe secret API key (`sk_live_...` or `sk_test_...`).
+ * @param stripeWebhooksEndpointSecret - The webhook signing secret from your Stripe dashboard,
+ *   used to verify that incoming webhook payloads are from Stripe.
+ * @param sync - An array of collection sync configurations for bidirectional Stripe sync.
+ * @param webhooks - One or more webhook handler functions mapped to Stripe event types.
+ */
 export type StripePluginConfig = {
   isTestKey?: boolean
   logs?: boolean
@@ -37,10 +106,27 @@ export type StripePluginConfig = {
   webhooks?: StripeWebhookHandler | StripeWebhookHandlers
 }
 
+/**
+ * An internal, sanitized version of `StripePluginConfig` where optional fields
+ * have been resolved to their defaults. Used internally by the plugin after initialization.
+ *
+ * @param sync - Always present (defaults to an empty array).
+ */
 export type SanitizedStripePluginConfig = {
   sync: SyncConfig[] // convert to required
 } & StripePluginConfig
 
+/**
+ * The signature for the Stripe REST proxy handler.
+ * Allows calling Stripe API methods from the client via a secure server-side proxy.
+ *
+ * @param args.stripeArgs - Positional arguments to pass to the Stripe SDK method.
+ * @param args.stripeMethod - Dot-notation path to the Stripe SDK method (e.g. `'customers.create'`).
+ * @param args.stripeSecretKey - The Stripe secret key used to authenticate the request.
+ *
+ * @returns A promise resolving to an object with the response `data`, an optional
+ *   error `message`, and an HTTP `status` code.
+ */
 export type StripeProxy = (args: {
   stripeArgs: any[]
   stripeMethod: string
diff --git a/packages/ui/src/elements/QueryPresets/cells/WhereCell/index.tsx b/packages/ui/src/elements/QueryPresets/cells/WhereCell/index.tsx
index ce179a8e2e9..b199ca63900 100644
--- a/packages/ui/src/elements/QueryPresets/cells/WhereCell/index.tsx
+++ b/packages/ui/src/elements/QueryPresets/cells/WhereCell/index.tsx
@@ -3,7 +3,22 @@ import type { DefaultCellComponentProps, Where } from 'payload'
 import { toWords } from 'payload/shared'
 import React from 'react'
 
-/** @todo: improve this */
+/**
+ * Converts a Payload `Where` query object into a human-readable natural language string.
+ *
+ * This function reads only the **first condition** of the query — specifically the first
+ * `and` clause inside the first `or` group (i.e. `where.or[0].and[0]`). Compound queries
+ * with multiple `or` / `and` conditions are not fully represented in the output.
+ *
+ * @example
+ * // Given a where query: { or: [{ and: [{ status: { equals: 'published' } }] }] }
+ * transformWhereToNaturalLanguage(where)
+ * // Returns: "Status equals Published"
+ *
+ * @param where - The Payload `Where` query object to transform.
+ * @returns A human-readable string representing the first condition in the query,
+ *          or `'No where query'` / `''` if the query is empty or cannot be parsed.
+ */
 const transformWhereToNaturalLanguage = (where: Where): string => {
   if (where.or && where.or.length > 0 && where.or[0].and && where.or[0].and.length > 0) {
     const orQuery = where.or[0]
@@ -32,6 +47,17 @@ const transformWhereToNaturalLanguage = (where: Where): string => {
   return ''
 }
 
+/**
+ * A table cell component used in the Query Presets list view to display
+ * a human-readable summary of a saved `Where` query filter.
+ *
+ * Renders the first condition of the query as a natural language string
+ * (e.g. `"Status equals Published"`). Falls back to `"No where query"` when
+ * the `cellData` is empty or absent.
+ *
+ * @param props - Standard `DefaultCellComponentProps` injected by Payload's table renderer.
+ * @param props.cellData - The `Where` query object stored in the Query Preset document.
+ */
 export const QueryPresetsWhereCell: React.FC<DefaultCellComponentProps> = ({ cellData }) => {
   return <div>{cellData ? transformWhereToNaturalLanguage(cellData) : 'No where query'}</div>
 }